Publications by authors named "Karl-Johan Myren"

Background: Paroxysmal nocturnal haemoglobinuria (PNH) is a chronic haematological disorder caused by uncontrolled complement activation, leading to intravascular haemolysis, indicated by increased lactate dehydrogenase levels (LDH). Standard-of-care complement factor 5 inhibitors have only recently been approved in China. Using real-world data, this study aimed to understand treatment pattern and burden of disease, including thrombosis risk, for Chinese patients with PNH.

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Background: Paroxysmal nocturnal hemoglobinuria (PNH) is a rare, chronic blood disorder. Symptoms such as fatigue can have a substantial impact on patients' physical activity levels, sleep, quality of life, and work productivity. Ravulizumab treatment can reduce thrombosis risk, improve survival and quality of life, and reduce fatigue in PNH, but information is limited on how it impacts sleep and physical activity.

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Article Synopsis
  • Paroxysmal nocturnal hemoglobinuria (PNH) is a rare blood disorder that can lead to severe complications like blood clots, kidney failure, and increased mortality due to uncontrolled activity of the immune system.
  • A study analyzed data from patients in the Korean National PNH Registry to evaluate how certain factors, especially lactate dehydrogenase (LDH) and hemoglobin levels, impact risks of complications and death in those not treated with complement inhibitors.
  • Results showed that high LDH levels and male sex increased the risk of thrombosis, while low hemoglobin did not predict serious outcomes; thus, managing hemolysis in PNH patients could enhance their health results.
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Article Synopsis
  • Ravulizumab is the first long-acting complement inhibitor approved for treating paroxysmal nocturnal hemoglobinuria (PNH), with a focus on Japanese adults.
  • In a study evaluating patient preferences between ravulizumab and eculizumab, 82.6% of participants favored ravulizumab due to its lower infusion frequency (every 8 weeks) compared to eculizumab (every 2 weeks).
  • The preference for ravulizumab suggests it enhances treatment convenience and quality of life for PNH patients, offering valuable insights for treatment decision-making.
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Background: Paroxysmal nocturnal hemoglobinuria (PNH) is a rare, life-threatening terminal-complement-mediated disease resulting in intravascular hemolysis and thrombosis with significant morbidity and premature mortality. There exists no disease-specific quality-of-life (QOL) measure for PNH. Its QOL effects resemble those of hematologic cancers, which supports the use of cancer-specific QOL measures in PNH clinical trials.

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Objective: The aim of this study was to develop a response mapping algorithm to predict EQ-5D-5L utilities from European Organisation for Research and Treatment Quality of Life Questionnaire Core 30 (EORTC QLQ-C30) scores and compare performance with direct mapping approaches to identify the best performing algorithm.

Methods: The Multi-Instrument Comparison dataset contains responses to both the EQ-5D-5L and QLQ-C30 questionnaires from 692 individuals with a broad range of cancers. Response mapping was conducted, fitting ordered logistic regressions to predict response levels for each of the five EQ-5D dimensions and utilities were predicted using the US and Japanese EQ-5D-5L value sets to test the algorithm performance.

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Aims: Paroxysmal nocturnal hemoglobinuria (PNH) is a rare and life-threatening intravascular hematologic disorder with significant morbidity and premature mortality. Clinical trials (NCT02946463 and NCT03056040) comparing ravulizumab with eculizumab for PNH have supported the non-inferiority of the former and similar safety and tolerability. This secondary analysis compared PNH trial participants after 26 weeks on either treatment (n = 438) to a general-population sample (GenPop) (n = 15,386) and investigated response-shift effects.

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Aims: Ravulizumab, engineered from eculizumab, provides sustained C5 inhibition in atypical hemolytic uremic syndrome (aHUS) while reducing dosing frequency (every 8 vs 2 weeks, respectively). Treatment choice often carries significant financial implications. This study compared the economic consequences of ravulizumab and eculizumab for treating aHUS.

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Aims: Prophylaxis with recombinant factor VIII (rFVIII) is the standard of care for severe hemophilia A in Sweden. The need for frequent injections with existing rFVIII products may, however, result in poor adherence to prophylaxis, leading to increased bleeding and long-term joint damage. Recombinant FVIIIFc (rFVIIIFc) is an extended half-life fusion protein which can offer prolonged protection and reduced dosing frequency.

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Background: Continuous prophylaxis for patients with hemophilia B requires frequent injections that are burdensome and that may lead to suboptimal adherence and outcomes. Hence, therapies requiring less-frequent injections are needed. In the absence of head-to-head comparisons, this study compared the first extended-half-life-recombinant factor IX (rFIX) product-recombinant factor IX Fc fusion protein (rFIXFc)-with conventional rFIX products based on annualized bleed rates (ABRs) and factor consumption reported in studies of continuous prophylaxis.

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Objectives: Asynchrony between patient and ventilator breaths is associated with increased duration of mechanical ventilation (MV). Neurally Adjusted Ventilatory Assist (NAVA) controls MV through an esophageal reading of diaphragm electrical activity via a nasogastric tube mounted with electrode rings. NAVA has been shown to decrease asynchrony in comparison to pressure support ventilation (PSV).

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Objective: To compare societal costs between patients treated with atomoxetine and placebo in Sweden.

Method: Ninety-nine pediatric ADHD patients were randomized to a 10-week double-blind treatment with atomoxetine (n = 49) or placebo (n = 50). All parents received four sessions of psycho-education.

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Objective: The study aims to evaluate psychosocial, societal, and family cost consequences of a psychoeducational intervention program.

Methods: Sixty boys with ADHD, Asperger syndrome/high-functioning autism (AS/HFA), and reading and writing disorder (RD/WD) were allocated to participate in a service evaluation project. Every other boy in each diagnostic group was randomly allocated to receive either (a) a special education program (clinical index group) or (b) follow-up without the special education program (clinical comparison group).

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